句子加工厂。

1．一群天真活泼的女孩在台上跳舞。

     缩句：                                                                                                    

2．这不是伟大的奇观吗？

     改成陈述句：                                                                                          

3．我们感受民族情。

     扩句：                                                                                                    

能力建设